So that 380V would be for 3 phase to a home which is not always the case. There are plenty of homes in Europe that only have single phase to the house which is at 230V.

That is incorrect. The EU/UK are on 230V at 50Hz at residential service entry. The point does not stand.

This varies.

Houses and apartments in Denmark have 3 phase service. My apartment's main breaker is labelled 40A @ 380V.

I believe the oven and hob make use of it, but I haven't looked myself.

400V between phases, 230V phase to neutral. Most homes have single phase though.

So how would you run an instant water heater or electric induction stove then? Every apartment and house I've ever lived in had 380V three-phase right to the kitchen, to the bathroom, and to basement rooms (e.g. for prosumer workshop tools).

> So how would you run an instant water heater or electric induction stove then? Every apartment and house I've ever lived in had 380V three-phase right to the kitchen,

I run an induction stove on 220V single phase every day here in the US.

Isn't it two phase? AFAIK in the US you have 240V two phase with 180° between them.

The US uses a single, split phase

https://en.wikipedia.org/wiki/Split-phase_electric_power

I wired one phase to all the burners and the oven. They're on a separate circuit with a 16 amp fuse. It's 2200W. Has mever tripped. 400V is just not very common for residential in the EU, maybe in the UK you have electric boilers and other powerful appliances. I had a good laugh when I saw that your codes require an electrical connection between the two taps. Makes total sense from a safety perspective but it's still funny.